Hello, I have successfully entegrated a dll-module (written udner .Net / c#) in fs which is loadable by the mod_managed component. Now, if I try to stream a wav file to the callee then the sound is very poor and choppy (also the file is played slower). The fs is running under Windows XP and tested under Windows 2003 with the same result. Streaming by using FreeSWITCH.Native.Api() works without problems, sound is perfect. Samples which I have tried: 1 - This works fine but delegate mechanism is missing there: FreeSWITCH.Native.Api fsApi = new FreeSWITCH.Native.Api(); string uuid = fsApi.ExecuteString("create_uuid"); string apiResult = fsApi.Execute("originate", string.Format("{{ignore_early_media=false,absolute_codec_string='PCMU'}}[origination_uuid={0},origination_caller_id_number={1}]sofia/gateway/Test/{2} &&playback({3}", uuid, callerID, phoneNumber, wavFile)); 2 - ManagedSession is integrated but we have sound problems: FreeSWITCH.Native.Api fsApi = new FreeSWITCH.Native.Api(); string uuid = fsApi.ExecuteString("create_uuid"); string apiResult = fsApi.Execute("originate", string.Format("{{ignore_early_media=false,absolute_codec_string='PCMU'}}[origination_uuid={0},origination_caller_id_number={1}]sofia/gateway/Test/{2} &park", uuid, callerID, phoneNumber)); FreeSWITCH.Native.ManagedSession blegSession = new FreeSWITCH.Native.ManagedSession(uuid); if (blegSession.IsAvailable) { while (!blegSession.answered()) { blegSession.sleep(500, 1); } if (blegSession.Ready() && blegSession.mediaReady()) { //blegSession.Answer(); //blegSession.Execute("playback",wavFile); blegSession.StreamFile(wavFile, 0); } blegSession.Hangup("Normal call clearing"); } Is there a mistake in my code or do I have forgotten something? Can you support me with some examples? Another issue is, that I am not able to make a origination directly by ManagedSession or CoreSession without using the FreeSWITCH.Native.Api(). How can I create an instance of a CoreSession object? Many thanks for you help in advance. Ali